2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/179111We present a QCD sum rule calculation of the strange-quark mass including four-loop QCD corrections to the correlator of scalar currents. We obtain $\bar m_s(1$ GeV$)=205.5\pm 19.1$ MeV.14 pages LaTex with 2 figures. Updated version including the recently computed 4-loop beta and gamma functionsHigh Energy Physics - Phenomenologytext